Internal-combustion engine



April 12,1927. 1,624,583

E. R. BURTNETT INTERNAL COMBUSTI'ON ENGINE lFiledy April s. 1925 Patented Apr.` 12, 192'7.

UNITED STATES i. i,Ti.-:`1\JT'orifice.y

EVERETT R. BURTNETT, OF LOS ANGELES, CALIFORNIA, ASSGNOIL'BY DIRECT AND MESNE ASSIGNMENTS, TO THE AUTOMOTIVE VALVES CO., OF LOS ANGELES, GALIn FOB/NIA, A VOLUNTARY TRUST.

lINTERNAL-G0MBUS'IION ENGINE.

Appiication inea apiii 9, i925. Asei-iai No. 21,826.`

My invention relates generally to inteinal combustion engines, and more particularly to improvements in charge volume transfer manifolds for engines that operate by the fresh `charge being lirst inducted into a pump chamber and then transferred into a combustion chambcr,the design as shown in the drawing forming a part hereof, being especially adapted for two stroke cycle intcrn'al combustion engines having three units, and each unit having a pump chamber -formed iii the larger diameter of one cylindei' oi eachA unit of two cylinders.

The structure -herein disclosed is an improvement von the transfer manifolds that iorni the subject matter of my co-pending patent applications, Ser. No. 2527, tiled Jan. th, '1925 and Ser. No. 20,117 tiled April 2, 1925.

In both of the aforesaid applications, the transfer ducts were located externally Aof the cylinder block andall on the saine side thereof.

Obviously, this arrangement increased to a certain extent, the overall 'width of the engine and it is the principal object of my pijesent invention to form the three ducts within the cylinder blockbetween the outer side walls of saidblock, and the walls of the cylinders therein and to locate the longer one ofthe ducts on one side of the cylinder block, and the `other two shorter ducts on the opposite side of said block.

As a result of thisarrangement, the width .of the cylinderblock is minimized and the lengths of the respective of the respective ducts are shorter' than if the ducts were eX- ternally arranged, consequently the distance of travelfof the charge volumes from the pumping or induction cylinders to the com bustion cylinders is reduced to a minimum.

With the foregoing and other objects in view, my invention consists ot certain novel -features of construction and arrangement otnparts that will be hereinafter more fully described and claimed and illustrated in the accompanying drawings in'which:

Figi 1 is a` horizontal section throughthe central portion of an engine cylinder block that is provided with the internally arranged ytransfer ducts as contemplated by my invention.

Fig. 2 is a side elevational view of a cylinder block with parts iii section and showing my improved arrangement of ducts.

Fig. 3 is an enlarged detail section taken on the line 3 3 of Fig. 1. Referring by numerals to the accompany- 'ing drawings, 1() designates a cylinder block having six combustion chambers 11, 12, 13, 14, 15 and 16, the axes thereof being parallel and in the same plane.

The diameters of chambers 11, 13 and 15 are uniform throughout their lengths while the lower portions of chambers 12, 14 and 16 are increased in diameter to form charge volume pumping chambers 17, 18 and 19 respectively.

Pistons such as 20 having straight diameters are arranged for operation within combustion chambers 11, 13 and 15 and the smaller portions of two diameter pistons, such as 21 are arranged foroperation within chambers 12, 14 and 16.

The larger portion 22 at the lower ends ol piston 2.1, operate within theeharge volume pumping chambers 17, 18A and 19.

A ycrank shaft 23 Vis mounted for rotary movement in four main bearings 24 in a crank case 25 and said' crank is provided with three crank throws 26, 27 and 28 that are disposed 120 apart.

The pistons in chamber 11 and the two dia-meter chamber 12, 17 are connected to crank 26 byy connecting rods 29, the pistons in chamber 13 and the two diameter chamber 14, 18, are connected to crank 27 by connecting rods 30 and the pistons in chamber-15 and thetwo diameter chamber 16, 19, are connected to crank 28 by connecting rods 31.

A head block 32 is secured on the head end ot' block 10 and formed in the underside of said block is a common compression and combustion clearance chamber 33, that connects the liead-or-inner ends of chambers 11 and 12. i

- A second common compression and conibustion clearancechamber 34 connects connects the inner ends of chambers 13 and 14 and a third clearance chamber 35 connects the head or inner ends ot chambers 15 and 16.

Formed inthe space between the outer wall of the cylinder blocks and the adjacent walls of kthe cylinders on one side of said block, and which spacers ordinarily used as aJ cooling` fluid circulation cell or cells, is a charge volume transfer duct 36, that leads :from the upper end of pumping,- chamber 19, to a transfer inlet port 3T that communi- Cates directly with an annular chamber titl andwhich latter has communi :ation with the lower portion ol combustion chamber l2 by means ol ports 89.

lFormed in the corresliionding space on the opposite side of the block l and leading,- from the upper portion ol pumping;` chamber 17 to chamber lt), that comnuilnicates with the lower portion of combustion chainber 14 by means of ports ell, is a charge vol inne transfer port l2.

The cross sectional dimensions` oi ducts #l2 and Sti are equal so that the volume llow capacity through the two ducts the same, but as the length ot' duct l2 is :onsiderably shorter than duct 3G, and it is necessary to obtain the same vacuum and prccompression pressures in the pumping;l chambers. the voh umetric displacement ot' duct i-:2 is increased and ,made equal to duct IBG by forming', im mediately above duct an auxiliary duct ll and the latter havingr communication with duct i152 by means ot an opening il that is formed through the lower end of the partition between said duets.

Formed in the block lt) on the same side with duct- Llf2 is a transiter duct l5 that is identical in size, torni and construction with said duct l-Q and said duct l5 from the upper end ol pumping:` chamber 1S to an annular chamber lo, that surrounds the lower portion of combustion chamber 1G and has conununication therewith through ports T.

VDuct etais provided on its top with an auxiliary duct 48 and thus ducts and lo are equal to each other and to longer duct 36 in both cross sectional dimensions and volumetric, displacement so that the volume low through allthree ducts will be the same and the same vacuum and precompression pressures will inevail in all three pumping chambers.

As a result of my improved arrangement of duet?, charge volumes are pumped from pumping;r chamber 1t) into combustion chamber 1Q trom punipinpr chamber 17 to combustion chamber llt and 'from punn'iing;` chamber 1S to conibustion chamber lG.

A. particularly desirable feature of my inveiition the location of the transfer ducts in the spaces between the outer side walls of the cylinder block and the adjacent walls oi the cylinders with the longer duct on one side and the two shorter ducts on the other side. Such arrangement enables the ducts to be formed in the engine block cristina` and docs not increase 'the overall width thereof.

By forming the apertures #ist at the lower ends of the partitions between the main and auxiliary chambers of the shorter transfer frees ducts, any condensation or liquid portions ol? the tuel mixture that might otherwise accumulate within the auxiliary chambers will drain through and tall in the rapidly moving" charge volume that passing through the duct at high velocity and thus he carried along; and again mixed with said charge volume.

lt will be readily understood that minor changes in the size.` :torni and construction ol the various parts ot my improved internal combustion engine may be mada and substituted for those herein shown and described without departing' 'trom the spirit oi the in vention, the scope ot which is set forth in the appended claims.

I claim as my invention:

l. The combination with an internal combustion engine ha vinn` six cylinders arranged in a row. three ot which cylinders are pro vided with charge volumepumping cha-inhers and with conlbustion chambers, ot three cliiarge volume transfer ducts arranged be tween the pumpirnsir chambers ot said three cylinders and the combustion chambers with in the other cylinders olf said three cylinders, one oiz which ducts has` greater length than the other two ducts, each shorter duct being provided on its upper portion with au aux iliary duct that has communication with the main chamber ot the duct by means oil an aperture located at the lower end of; said auxiliary duct, and all three ducts being dis posed inside the outer walls of the cylinder block.

Q. The combination with an internal comi bnstion engine having' six cylinders, three ol which are provided with charge volume pumpingr chambers and with combustion chambers` ol three charge volume transfer ducts arranged between the pumping chambers oi said three cylinders and the combustion chambers within the other` cylinders of said three cylinders; one of which transfer ducts has `greater length than the other two ducts, all of which ducts have the same volumetric capacity, and all three ductsbeing disposed inside the outer walls of the cylinder block.

5l. The combination with an internal com bustion engine having;r six cylinders, three of which are provided with charge volume punipinp; chambers and with combustion chambers, of three charge volume transfer ducts arranged between the pumping chambers oi said three cylinders; and the combustion chambers within the `other cylinders ot said three cylinders, two of said transfer ducts being shorter than the third duct, a partition arranged within each shorter duet and dividingr the space therein'into a. main chamber and an auxiliary chamber, and all three ducts beingr disposed inside the outer walls ot the cylinder block. i

Ll. The combination with an internal combustion engine having six cylinders, three of which are provided with combustion chambers and with charge volume pumping chambers, of three charge volume transfer ducts ar 'anged between the pumping chambers of said three cylinders `and the combustion chambers within the other cylinders of said three cylinders, two of said transfer ducts being shorter than the third duct, apartition arranged within each shorter-duct and dividing the space therein into amain chamber and an auxiliary chamber, there being an opening formed through the lower portion of said partition for establishing communication between the main and auxiliary chambers therein and said three ducts being disposed inside the outer walls of the cylinder block.

5. A charge volume transfer duct structure for six cylinders two stroke cycle internal combustion engines comprising three separate ducts, one of which is longer than the other two each shorter duct having connected main and auxiliary chambers whereby the volumetric capacities of the chambers of the two shorter ducts are equal, and to the chamber within thelonge-r duct, and all three ducts being disposed inside the outer walls of the cylinder block.

6. A charge volume transfer ductl structure for six cylinder two stroke cycle internal combustion engines comprising three separate ducts, one of which is longer than lthe other, a partition within each shorter duct for dividing the space there-in into a main chamber, said partit-ion being provided at its lower end with an opening that establishes communica-tion between said main and auxiliary chambers, and all three ducts being disposed inside the outer walls of the cylinder block.

7. The combination with an internal combustion engine having six cylinders, three of which are provided with combustion chambers and with charge volume pumping chambers, three charge volume transfer ducts arranged between the pumping chambers of said three cylinders and the combustion chambers within the other cylinders of said three cylinders, one of said ducts being longer than` the other two, the three ducts having the saine volumetric capacity, the longer duct being located on one side of the cylinder block and the two shorter ducts being located on the opposite side of the cylinder block.

8. The combination with an internal combustion engine having six cylinders, three of which are provided with combustion chambers and with charge volume pumping chambers, three charge volume transfer ducts arranged between the pumping chambers of said three cylinders and the combustion chambers within the other cylinders of said three cylinders, one of said ducts being longer than the other two, the longer duct being loca-ted kon one side of the cylinder block, the two shorter ducts being located on the opposite side of the cylinder block and all three ducts being disposed inside the outer walls of the cylinder block.

In testimony whereof I aiix my signature.

EVLRETT a. BURTNETT. 

